When modifying the SQL Server Configuration, you may see the following pop-up:
"Could not connect to the SQL database. Please check the connection credentials"
This issue can be caused if SQL Express is being used, and the SQL Server host name is set as the netbios name of the SQL server or "localhost".
SQL Express installs the default server as an instance called SQLEXPRESS on the database server, so enter the SQL Server host name as: NETBIOSNAME\SQLEXPRESS to resolve this issue.